Kenwood KRC-794/Y Service Manual Download Page 18

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118

LCD DRIVER

REMOTE
SENSOR IC

RST

REMO
SW

AVR

KEY SCAN
SW

D26

X16-

10.7V

5.0V

8.5V

6.8V

5.1V

3.4V

1.7V

5.0V

10K

IC1

IC2

(X16-1540-12)

ED1

ILL+B

ILLUM G

L CLK

L CE

RESET

L DATAS

L DATAL

DIMMER

REMO

D GND

CP2

KI1

KI4

KI3

KI2

4.7

R11

100

KS5

KS4

KS3

KS2

KS1

COM1

COM2

COM3

COM4

COM5

COM6

COM7

COM8

COM9

COM10

S60

S10

S11

S12

S13

S14

S15

S16

S17

KI5

REMO

RED

GREEN

KEY

VDD

VLCD

VLCD0

VLCD1

VLCD2

VLCD3

VLCD4

VSS

TEST

OSC

INH

S10

S15

S14

S13

S12

S11

S17

S16

S60

KS1

KS4

KS2

KS3

CP3

C4 0.1

C3 0.1

C2 0.1

100

2.2

KI3

KI2

KI4

KI1

KS6

KI5

R13

VDD

S.GND

R10

CP1
470

R8 22K

100

C1 680P

R1 43K

GND2

VCC

GND1

OUT

KS5

R14 1K

3.9K

2.2K

22K

750

SEG17

SEG1

SSEG9

SEG5

SEG3

SEG4

SEG2

SEG8

SEG7

SEG6

SEG13

SEG12

SEG11

SEG10

SEG14

SEG15

SEG16

S10

S11

S12

S14

S13

S15

S16

COM1

S60

S56

S57

S59

S58

S54

S55

COM3

COM2

COM4

COM5

COM6

COM7

COM8

SEG60

SEG58

SEG59

SEG57

SEG56

SEG54

SEG55

S32

SEG25

SEG21

SEG20

SEG19

SEG18

SEG22

SEG23

SEG24

S17

S18

S20

S19

S21

S22

S23

S24

SEG26

SEG27

SEG28

SEG32

SEG31

SEG30

SEG29

S28

S26

S25

S27

S30

S29

S31

S40

SEG36

SEG35

SEG33

SEG34

SEG38

SEG39

SEG40

SEG37

S36

S34

S33

S35

S38

S37

S39

SEG42

SEG43

SEG44

SEG41

SEG47

SEG46

SEG45

S44

S42

S41

S43

S46

S45

S.GND

+10.7V

+5V

R12

0.1

2.2

+10.7V

CAUTION : For continued safety, replace safety critical components only with manufacturer's
recommended parts (refer to parts list).

Indicates safety critical components. To reduce the risk of electric shock, leakage-current or

resistance measurements shall be carried out (exposed parts are acceptably insulated from the
supply circuit) before the appliance is returned to the customer.

• DC voltages are as measured with a high impedance voltmeter. Values may vary slightly due to

variations between individual instruments or/and units.

KRC-794/Y

X16-1540-12 (1/2)

www. xiaoyu163. com

QQ 376315150

TEL 13942296513

TEL 13942296513 QQ 376315150 892498299

Summary of Contents for KRC-794/Y

Page 1: ...Screw set N99 1704 05 MASK key RC 410 Knob 1 6 K25 1405 12 Knob VOL K25 1404 13 Knob UP DW K25 1408 03 Front glass B10 4222 03 Front glass B10 4398 01 Knob SRC K24 3835 04 Knob FM AM K25 1406 03 Panel assy A64 3030 02 Knob PROG K25 1407 03 CASSETTE RECEIVER KRC 794 Y SERVICE MANUAL The CASSETTE MECHANISM OPERATION DESCRIPTION is the same model D40 1122 05 Please refer to the service manual for mod...

Page 2: ...M SW2 SRM SW1 RCLK QUAL RDATA NOISE S METER IFC IFC OUT PLL DATA PLL CLK MS OUT MTL ON OFF MODE 2 MODE 3 R REEL MODE 1 F REEL MS MODE F R MUTE DOLBY ON OFF DATA C CH RST CH MUTE DOLBY B C DATA H CH CON CH CLK REQ H REQ C TAPE IN SRM DET RESET SUB MOT2 SUB MOT1 SUB MOT3 CASS SRM MOTOR ILL ON AM B FM B SCK SDA PRE MUTE MUTE BEEP P MUTE ACC DET PHONE DIMMER EXT AMP CONT P CON P 5V P ON ANT CONT B U D...

Page 3: ...R Inverted darlington connection Q20 is turned ON when Q18 s base goes H Q21 22 B U 5V AVR Inverted darlington connection Q22 is turned ON when Q21 s base goes H Q23 SW 5V ON when the base goes L Q24 B U detection ON when the base goes H during B U applied Q25 ACC detection ON when the base goes H during ACC applied Q28 31 P CON SW Q28 is turned ON when Q31 s base goes H Q32 Dimmer SW ON when the ...

Page 4: ...tected H 24 DIMMER I Small detection terminal ON L OFF H 25 SW 5V O 5 V power supply terminal ON L OFF H 26 CH MUTE I Muting request from CH ON H OFF L 27 CH CON O CH control output ON H OFF L 28 CH REQH O Request output to CH Requested L 29 CH RST O Reset output to CH Normal L When the system is reset turns H then L in 400 ms after recovery from reset 30 EXT AMP CONT O External amplifier control ...

Page 5: ...t detected H 70 AVCONT O AD reference voltage control output Same timing as P ON H during operation 71 Avdd Positive power supply terminal 72 Avss Grounding terminal 73 Avref I Reference voltage supply terminal for A D converter 74 PHONE I PHONE detection terminal TEL MUTE No more than 1 V NAVI MUTE 2 5 V or more 75 R REEL I Cassette mechanism reel pulse input REV Vth 2 5 V 76 F REEL I Cassette me...

Page 6: ... not detected momentary power down H 94 CH DATAC I DATA input terminal from CH 95 CH DATAH O DATA output terminal to CH 96 CH CLK I O CLOCK input output terminal from to CH 97 L DATA L I DATA line from LCD driver 98 L DATA S I O DATA line to LCD driver 99 L CLK I O CLK line to LCD driver Panel detected L 100 N C O Outputs Low No connection www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 139422...

Page 7: ... played 7 Audio related specifications A short press of the Q key initiates the audio adjustment mode Pressing the key on the remote initiates the audio adjustment mode Continuous holding of a remote control key is inhibited Bass Middle and Treble are adjusted in 3 steps of Min Center Max with the Track Up Down keys Balance is adjusted in 3 steps of Left Max Center Right Max with the Track Up Down...

Page 8: ...est mode Note All Clear is not applicable to the security code of this model Simplified method of clearing the security code K Type only 1 While the code entry is requested press and hold the VOL UP key for 3 seconds while holding the DISP key pressed This should turn off 2 Enter KCAR from the remote Same way as the 00 model Press the 5 key on the remote twice then press the Track Up key This ente...

Page 9: ...ode is initiated The display at this time should show in place of 3 Press and hold the key on the Master key remote for more than 3 seconds 4 When TRANSMIT2 is displayed press and hold the key on the Master key remote for more than 3 seconds 5 When APPROVED is displayed the Mask key is cleared the demonstration mode is initiated the test mode is terminated and the unit returns to the factory condi...

Page 10: ...C into the slit of Roller ass y then release the end of Roller ass y and the tongue No 1 AZIMUTH TCC 153 10kHz Connect an AC voltmeter to SP OUT TAPE PLAY Head Azimuth Screw Adjust the azimuth for each Lch Rch or FWD RVS becomes maximum 2 PLAY BACK LEVE TCC 130 Connect an AC voltmeter to CN2 TAPE PLAY VR1 L VR2 R X87 387 5mV 6dBm CASSETTE DECK SECTION ITEM INPUT SETTINGS OUTPUT SETTINGS TUNER RECE...

Page 11: ...2 J74 1306 12 X16 1540 12 J74 1306 12 ED1 D24 D23 IC2 D10 D9 D12 D11 D6 D5 D8 D7 D13 D20 D22 D21 D18 D15 D14 D17 D16 D3 D1 D2 W5 13 C16 W2 C5 W4 W3 W6 W7 1 W8 VR1 C6 DOLBY W9 DOLBY R VR2 W1 1 2 4 5 C15 L DOLBY L R 1 3 CN4 J74 1148 12 S1 CN3 CN2 X87 3022 71 IC1 Q1 C4 W14 R4 C17 C24 31 30 R12 C26 C8 R14 C12 C14 R7 C22 W12 R6 20 21 R8 C23 R11 10 11 1 40 C13 R10 C21 C20 R9 C7 R5 C25 C11 E B R13 R1 C1 ...

Page 12: ...8 C169 W19 C112 R125 R108 L4 L7 X3 L12 C190 C226 C222 C85 C132 C82 C87 E L1 C92 C154 L8 R118 C253 L9 C252 SMET 1 24 7 6 2 1 13 1 1 2 25 24 1 9 16 8 2 1 5 7 6 10 9 3 4 8 12 11 13 B B E B E B E B E E B 1 2 12 11 1 10 1 2 13 12 1 28 15 14 1 25 26 50 51 75 76 100 1 8 9 16 E B E B E E IC2 Q73 IC11 D52 D21 Q3 Q1 Q4 Q46 Q39 Q86 Q87 Q24 Q25 Q34 Q32 Q85 IC1 D6 D3 Q2 D5 Q90 Q71 Q36 Q44 D16 D14 D12 Q26 Q28 P...

Page 13: ...H1 C36 C37 R10 C35 R24 R34 R167 R198 R376 C225 C221 C223 R221 C5 C6 R199 R313 C97 R168 C172 W106 C173 R47 R37 R8 R9 R7 R23 R33 C59 R38 R48 C60 G O I 1 7 14 8 4 3 1 2 D51 Q33 Q18 Q19 Q37 Q43 Q45 Q41 Q27 D32 Q31 Q30 Q29 D81 D82 IC15 IC10 Q21 D1 IC3 D22 Q23 D50 Q72 Q88 Q89 D2 X14 6442 73 J74 1397 02 PC BOARD FOIL SIDE VIEW KRC 794 Y Ref No address Ref No address Ref No address Ref No address IC3 IC10...

Page 14: ...K VR1 4 7 R13 1K 0 01 47u10 C6 C11 0 1 4700P C17 0 47 C20 1 SUB SUB MOT B 2 3 1 W11 R5 C15 33u10 180 R3 24K C3 470P 1 2 3 4 C5 470P R2 R1 24K C1 470P C2 24K 33u10 2 3 4 14 MS OUT PB REF 8 LINE OUT1 TAPE IN1 OUT REF1 PB OUT1 40 2 1 PB FB1 PBTC1 VCC 5 4 3 7 6 NC PB GND PB R IN1 39 PB F IN1 37 38 TCL1 TCH1 10 9 MSLPF R8 220K R10 33K R9 2 7K C24 C23 0 47 13 12 11 G1FB G2FB MSTC 36 VCT 35 33 PB GND PB ...

Page 15: ... RR ACC TEL MUTE P CON EXT AMP CONT ANT GND DIMMER 6 7 3 4 5 13 11 12 14 15 8 BUP 16 C30 4 3300u16 RL RL FL FL 1u50 C114 15 1 9 5 4 3 6 2 11 10 12 13 8 7 CH CON MUTE A GND RST Rch REQC DATA C DATA H Lch CH CLK 1 2 3 4 5 6 7 8 9 10 11 12 13 REQ H B U MUTE Rch A GND REQ C RST DATA C CH CLK Lch DATA H D GND CH CON 3 21 10 12 12 10 10K R111 R112 100K 0 01 C93 R117 1K 560 R114 30 24 C94 1u50 R113 10K 0...

Page 16: ...VDD A VSS AVREF PHONE CH MUTE CH CON CH REQH CH RST EXT AMP CONT RESET XT1 XT2 REGC X2 X1 VSS VDD CLK OUT NC MOTOR MODE 3 MODE 1 MODE 2 NC SUB MOTOR 1 SUB MOTOR 2 SUB MOTOR 3 CAS SRM NC CP4 1K 1K R359 69 68 67 66 65 R328 100K R326 100K 100K R323 100K 100K 63 R324 53 CP3 1K CP2 4 7K X1 20MHz X2 0 01 C251 27P C302 C301 C303 1 29 30 26 27 28 42 46 47 48 44 43 R303 470 47K R352 R302 470 R305 4 7K R304...

Page 17: ... 89 91 99 95 94 78 79 47K R365 R366 47K R303 470 R302 470 R304 4 7K 1 2 4 5 R301 1K 2 1 4 3 6 5 8 7 9 11 10 12 13 R376 470 R374 470 R373 470 R372 1K R371 1K R370 470 ILL GND ILL B L CLK L CE RESET L DATAS L DATAL DIMMER PAN RESET REMO NC D GND VDD 17 10 89 65 99 98 64 RDS OUT AM IF OUT S METER AUDIO OUT VDD 5V NOISE OUT DIG GND SDA SCL IFC OUT PLL B OSC GND VT FM ANT OSC GND OSC GND W N OSC GND AM...

Page 18: ...12 SEG11 SEG10 29 28 30 SEG14 SEG15 SEG16 33 32 34 S9 S10 S11 S12 S14 S13 S15 S16 COM1 S60 S56 S57 S59 S58 S54 S55 COM3 COM2 COM4 COM5 COM6 COM7 COM8 SEG60 SEG58 SEG59 SEG57 SEG56 SEG54 SEG55 S32 43 SEG25 39 SEG21 SEG20 SEG19 SEG18 37 36 38 SEG22 SEG23 SEG24 41 40 42 S17 S18 S20 S19 S21 S22 S23 S24 SEG26 SEG27 SEG28 45 44 46 SEG32 SEG31 SEG30 SEG29 47 48 50 49 S28 S26 S25 S27 S30 S29 S31 S40 SEG36...

Page 19: ...OM9 COM10 S60 S59 S58 S57 S56 S55 S54 S53 S52 S51 S45 S44 S43 S42 S41 S40 S39 S38 S37 S36 S35 S34 S33 S32 S31 S30 S29 S28 S27 S26 S15 S16 S17 S18 S19 S20 S21 S22 S23 S24 S25 S15 S20 S19 S18 S17 S16 S21 S22 S23 S38 S34 S32 S31 S33 S36 S35 S37 S46 S42 S40 S39 S41 S44 S43 S45 S47 S50 S30 S29 S60 S59 S58 S57 S56 S55 S54 S53 S52 S51 C11 0 01 10K R16 S49 S48 S25 S24 S50 S46 S47 S48 S49 28 29 30 31 32 S2...

Page 20: ...24 45 23 65 65 66 66 67 67 10 11 1 31 30 34 33 9 9 HD1 17 15 4 22 12 12 20 5 6 7 26 48 48 49 27 94 91 92 94 D N G H C C F B E E E B G 893 H N D 876 Ax2 Ax2 K J J 44 www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 ...

Page 21: ...B B B C F 212 217 756 738 794 786 702 791 739 793 788 734 227 225 226 228 229 204 251 262 243 203 258 206 210 224 216 230 231 223 242 PME1 PA1 248 208 245 257 232 X14 X16 118 X16 118 246 247 201 259 241 281 222x2 RM1 DC1 RM2 283 219 267 268 753 266 270 271 269 233 714 209 220 304 301 303 302 304 790 ED1 X16 www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1...

Page 22: ...No A d d N e w Parts No Description H10 4767 12 POLYSTYRENE FOAMED FIXTURE H25 0329 04 PROTECTION BAG 280X450X0 03 H25 0337 04 PROTECTION BAG 180X300X0 03 H25 1108 04 PROTECTION BAG 100X300X0 03 H30 0544 04 ADHESIVE DOUBLE COATED TAPE H54 2729 03 ITEM CARTON CASE E2 H54 2730 03 ITEM CARTON CASE E3 257 2C J21 9651 13 MOUNTING HARDWARE ASSY 258 2C J21 9699 04 MOUNTING HARDWARE 259 1C J21 9716 03 MOU...

Page 23: ...NECTOR J1 E58 0863 15 RECTANGULAR RECEPTACLE Ref No A d d N e w Parts No Description J2 E63 0853 05 PIN JACK J3 E56 0834 05 CYLINDRICAL RECEPTACLE WH1 E30 4804 05 CORD WITH PLUG L1 L33 1039 05 LINE FILTER COIL L3 4 L40 4795 91 SMALL FIXED INDUCTOR 4 7UH J L5 L40 4791 17 SMALL FIXED INDUCTOR 4 7UH K L6 L40 4795 91 SMALL FIXED INDUCTOR 4 7UH J L7 L40 4791 17 SMALL FIXED INDUCTOR 4 7UH K L8 9 L40 479...

Page 24: ...R 2 2K J 1 10W R307 RK73GB2A225J CHIP R 2 2M J 1 10W R308 309 RK73GB2A102J CHIP R 1 0K J 1 10W R310 313 RK73GB2A103J CHIP R 10K J 1 10W R315 RK73GB2A472J CHIP R 4 7K J 1 10W R321 RK73GB2A104J CHIP R 100K J 1 10W R324 RK73GB2A104J CHIP R 100K J 1 10W R326 RK73GB2A104J CHIP R 100K J 1 10W R328 RK73GB2A104J CHIP R 100K J 1 10W Ref No A d d N e w Parts No Description R331 333 RK73GB2A102J CHIP R 1 0K ...

Page 25: ...ription Q43 DTC114YK DIGITAL TRANSISTOR Q43 KRC107S DIGITAL TRANSISTOR Q44 UMC2N TRANSISTOR Q45 2SA1576A TRANSISTOR Q45 2SB1218A TRANSISTOR Q46 DTC144EK DIGITAL TRANSISTOR Q46 KRC104S DIGITAL TRANSISTOR Q71 DTA124EK DIGITAL TRANSISTOR Q71 KRA103S DIGITAL TRANSISTOR Q72 DTC124EK DIGITAL TRANSISTOR Q72 KRC103S DIGITAL TRANSISTOR Q73 2SC2412K TRANSISTOR Q73 2SD601A TRANSISTOR Q85 DTC144EUA DIGITAL TR...

Page 26: ... A d d N e w Parts No Description 4 3B D10 4375 08 SLIDER MAIN PLATE 5 3A D13 1494 08 GEAR B 6 3A D13 1495 08 GEAR C 7 3A D13 1496 08 GEAR D 9 2B D10 4376 08 ARM P G PLATE 10 2B J90 0948 08 GUID 11 2B D15 0919 08 PULLEY MID 12 2B D13 1497 08 GEAR P 15 2B J21 9458 08 MOUNTING HARDWARE HEAD P AS 17 2B G02 1332 08 FLAT SPRING HEAD SP P 20 2A D13 1498 08 RACK GEAR OP PLATE A 21 1A D10 4377 08 LEVER EJ...

Page 27: ...0 100 More than 10µF 10 50 20 20 0 Less than 4 7µF 10 75 Voltage rating 2nd word A B C D E F G H J K V 1st word 0 1 0 1 25 1 6 2 0 2 5 3 15 4 0 5 0 6 3 8 0 1 10 12 5 16 20 25 31 5 40 50 63 80 35 2 100 125 160 200 250 315 400 500 630 800 3 1000 1250 1600 2000 2500 2150 4000 5000 6300 8000 CHIP CAPACITORS EX C C 7 3 F S L 1 H 0 0 0 J Refer to the table above 1 2 3 4 5 6 7 1 Type Chip CH RH UJ SL 2 S...

Page 28: ... GULF FZE P O Box 61318 Jebel Ali Dubai U A E KENWOOD ELECTRONICS THAILAND CO LTD 2019 New Pechburi Road Bangkapi Huaykwang Bangkok 10320 Thailand KENWOOD ELECTRONICS SINGAPORE PTE LTD 1 Genting Lane 07 00 Kenwood Building Singapore 349544 KENWOOD ELECTRONICS MALAYSIA SDN BHD 4 01 Level 4 Wisma Academy Lot 4A Jalan 19 1 46300 Petaling Jaya Selangor Darul Ehsan Malaysia FM tuner section Frequency r...

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